Information

SIM_SOPT2[RTCCLKOUTSEL]
RTC_CLKOUT
RTC 1Hz clock
RTC 32kHz clock
RTC_CR[CLKO]
Figure 3-40. RTC_CLKOUT generation
3.8.6.2 RTC_WAKEUP signal
The RTC_WAKEUP pin is not supported on this device.
Communication interfaces
3.9.1 Universal Serial Bus (USB) FS Subsystem
The USB FS subsystem includes these components:
• Dual-role USB OTG-capable (On-The-Go) controller that supports a full-speed (FS)
device or FS/LS host. The module complies with the USB 2.0 specification.
• USB transceiver that includes internal 15 kΩ pulldowns on the D+ and D- lines for
host mode functionality.
• A 3.3 V regulator.
• USB device charger detection module.
• VBUS detect signal: To detect a valid VBUS in device mode, use a GPIO signal that
can wake the chip in all power modes.
USB controller
FS/LS
transceiver
USB voltage
regulator
D+ D-
VREGIN
Device charger
detect
VOUT33
Figure 3-41. USB Subsystem Overview
3.9
Communication interfaces
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
112 Freescale Semiconductor, Inc.